Span Frequency Alarm; Span Drift Transient Event - Symmetricom TimeSource 2500 Manual

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Span Frequency Alarm

Span Frequency Transient event data is processed through a
leaky-bucket alarm manager, to control escalation to an event, or
directly to a minor alarm. The nominal time to escalate is
4 seconds, and the maximum time to retire is 75 seconds. Normal
SONET pointer adjustments or network rearrangement transients
will not produce an alarm. A span frequency alarm condition
represents a significant frequency error on the incoming span line.
Maintenance action required: Timing on the incoming span line is
not within network specifications. Troubleshoot the source of the
timing for the incoming span line, or contact the span line service
provider.

Span Drift Transient Event

The TimeSource 2500 measures the relative difference between
the input frequency of a span and the output frequency. The input
frequency is smoothed, using a smoothing filter, which detects and
removes transients above the normal operating range of a span
line. The drift event will be triggered by SONET pointer
adjustments, and other network rearrangement-related transient
events. This permits these transients to be detected and removed
before they impact the system. The TimeSource 2500 checks for
drift events every 4 seconds.
Maintenance action required: None.
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Troubleshooting
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